Been there, done that. I dated 6 times, broke up, dated again a year later. We’ve been happily married for almost 20 years. The question is
a) how long did you date?
b) why did you break up?
Obviously if you’re willing to go out again, it was for something not too important. Definitely don’t pretend like you never met. If you’re looking to have an open and honest relationship, why would you want to have that uncomfortableness? It can only be an ice-breaker and it might be the beginning of the rest of your life. If you want to break off the awkardness, make it more of a light conversation, maybe even joke about it.(tastefully)
Good luck